Best Laptop internet usb device?

We have been using sprint air-cards on the 3g network for a few years but are not satisfied with the speed..Do any of you have advice on a 4g device for Oahu primarily and Mainland use from time to time?

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My coworker tethers on Verizon's 3G with good results (I did previously also with good results). I've heard much criticism of Clear. Doubt the USB interface would be a bottleneck relative to the network.